Effect of carbon tetrachloride (CCl4) sonochemistry on the size of active bubbles for the production of reactive oxygen and chlorine species in acoustic cavitation field

Dehane, Aissa; Merouani, Slimane; Hamdaoui, Oualid

doi:10.1016/j.cej.2021.130251

Cited by 28 publications

(17 citation statements)

References 93 publications

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Section: Theoretical Packagementioning

confidence: 99%

“…For the simulation of the bubble dynamics and the internal bubble chemistry, the mathematical model developed early by our research group [60] , [61] for studying the CCl 4 sonochemisty is used. A detailed discussion about these reaction schemes is available in [60] , [61] . The model is based on a set of ordinary differential equations that account for non-equilibrium evaporation and condensation of water vapor at the bubble wall, heat transfer between the bubble interior and the surrounding liquid, chemical reactions heat, and CCl 4 pyrolytic reactions.…”

Section: Theoretical Packagementioning

confidence: 99%

“…Table 2 , Table 3 show the reaction mechanism used to study the internal bubble chemistry for an Ar-CCl 4 -bubble ( Table 2 , 31 reversible reactions) and an O 2 -CCl 4 -bubble ( Table 3 , 29 reversible reactions). A detailed discussion about these reaction schemes is available in [60] , [61] . Table 1 contains the following main equations: Eq.…”

Section: Theoretical Packagementioning

confidence: 99%

“…The resolution approach of the set of differential equations shown in Table 1 is described in detail in our earlier work [60] , [61] . In order to simulate the bubble chemistry as well as the CCl 4 degradation inside a single bubble under the experimental conditions of Pétrier and Francony [62] and Hung and Hoffmann [48] , a collection of ambient bubble radii (R 0 ) is used.…”

Section: Theoretical Packagementioning

confidence: 99%

“…In fact, the reactivity of CCl 4 toward hydroxyl radical is negligible [49] , [59] . Recently, our research group has published two interesting computation works on CCl 4 degradation by ultrasound [60] , [61] , where a new reaction scheme for CCl 4 has been used to identify the main reactive chlorine species (RCS: ● CCl 3 , : CCl 2 and ● Cl and HOCl) resulted from the pyrolysis of CCl 4 within a single acoustic bubble. According to the results of these works [60] , [61] , CCl 4 degradation within the bubble not only produces RCS but also accelerates the generation of hydroxyl radical through its strong scavenging effect on H ● radical (CCl 4 +H ● → HCl+ ● CCl 3 ).…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

An alternative technique for determining the number density of acoustic cavitation bubbles in sonochemical reactors

Dehane

Merouani²,

Hamdaoui

et al. 2022

Ultrasonics Sonochemistry

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Section: Theoretical Packagementioning

confidence: 99%

Section: Theoretical Packagementioning

confidence: 99%

Section: Theoretical Packagementioning

confidence: 99%

Section: Theoretical Packagementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

An alternative technique for determining the number density of acoustic cavitation bubbles in sonochemical reactors

Dehane

Merouani²,

Hamdaoui

et al. 2022

Ultrasonics Sonochemistry

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A semi‐empirical approach for determining the number density and void fraction of acoustic cavitation bubbles in sono‐reactors

Dehane,

Merouani

2024

Vietnam Journal of Chemistry

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A new semi‐empirical technic has been established relying on the linkage between the chemistry in the bulk liquid and that taking place in the acoustic cavitation bubble. The open‐source COPASI software has been used for the optimization of number density according to the total yield of a single bubble and the fitting of the experimental yield of hydrogen peroxide in the sonicated solution. It was observed that the number density is increased with the rise of ultrasound frequency from 200 to 1140 kHz, independently of the saturating gas nature (O2, Ar or air). Within this range of wave frequencies, i.e. from 200 to 1140 kHz, the number of active bubbles goes up from 9.35 × 107 to 3.65 × 1015 L−1 s−1. On the other side, it has been demonstrated that the number density obtained under air atmosphere is greater than that resulting either under argon or oxygen‐saturating gas. Interestingly, with respect to the saturating gas nature (O2, Ar, air) and the range of ultrasound frequency (200–1140 kHz), it was observed that the increase of number density was not necessarily accompanied by a proportional increase of void fraction (total volume of bubbles).

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Insight into the role of dissolution mechanism in the sonochemistry of acoustic cavitation bubble

Dehane,

Merouani

2023

Vietnam Journal of Chemistry

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Using a detailed numerical model, in the present work, the dissolution process of the different species generated by the acoustic cavitation bubble was investigated through the analysis of bubble chemistry over a range of wave frequencies from 140 to 515 kHz. It has been observed that during the first bubble collapse, at 140 and 213 kHz, significant amounts of ●OH, O, H●, H2, and O2 molecules (from ~ 2.1×10‐20 to 4.86×10‐18 mol) are dissolved into the bulk liquid (2.84‐0.067%). However, with the rise of ultrasound frequency (>213 kHz), the number and the quantity of the dissolved substances are decreased (<1.16×10‐20 mol) until to be completely suppressed at 515 kHz. Over the first compression period, at 140 and 213 kHz, the dissolution tendency is in the order: H2 (4.86×10‐18‐9.44×10‐19 mol) > H● (4.41×10‐18‐7.76×10‐19 mol) > O (1.8×10‐18‐2.75×10‐19 mol) > ●OH (4.68×10‐19‐1.91×10‐19 mol) > O2 (8.43×10‐20‐2.1×10‐20 mol). Nevertheless, at 355 kHz, the dissolution of the main substances is in the order: H● (1.16×10‐20 mol)>●OH (5.13×10‐21 mol)>H2 (3.59×10‐21 mol). Despite the low dissolution percentages of the different species (compared to the total yield) during the first bubble collapse (<3%), it has been observed that the corresponding molar amounts (depending on the applied frequency) are of great importance (≤ 4.86×10‐18 mol). On the other hand, independently of the number of acoustic cycles (1, 2 or 3), the dissolution tendency of the different species, at 140 and 213 kHz, is in the order: H2 > H● > O > O2 > ●OH > O3 > HO2● > H2O2. Nevertheless, above 213 kHz, this ranking starts to be disturbed with the dominance of the main species, i.e. H2, H●, O, ●OH, and O2 molecules. According to the obtained findings in the present paper, the importance of the dissolution mechanism (into the bubble chemistry) is clearly evidenced; therefore, for an accurate simulation of the chemistry of an acoustic cavitation bubble, the consideration of the dissolution process should be taken into account throughout the bubble's oscillation.

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Effect of carbon tetrachloride (CCl4) sonochemistry on the size of active bubbles for the production of reactive oxygen and chlorine species in acoustic cavitation field

Cited by 28 publications

References 93 publications

An alternative technique for determining the number density of acoustic cavitation bubbles in sonochemical reactors

An alternative technique for determining the number density of acoustic cavitation bubbles in sonochemical reactors

A semi‐empirical approach for determining the number density and void fraction of acoustic cavitation bubbles in sono‐reactors

Insight into the role of dissolution mechanism in the sonochemistry of acoustic cavitation bubble

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